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Author Topic: Antenna: mobile to base?  (Read 2199 times)
KC8YKB
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Posts: 8




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« on: January 19, 2012, 11:37:38 AM »

Has anyone converted a 2 meter mobile antenna to a base antenna?
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WB6RXG
Member

Posts: 73




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« Reply #1 on: January 19, 2012, 12:01:58 PM »

If it's not a halfwave antenna intended for mounting on a fiberglass boat or car all that is needed is the addition of a groundplane made up of four appropriately sized radials.  For 2 meters 19.5" would be about right.

73.
Stuart
WB6RXG
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WB6BYU
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Posts: 13567




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« Reply #2 on: January 19, 2012, 12:25:29 PM »

One of my mobile antennas came with a kit that included a NMO base that straps on a mast
and a radial kit.  But if you have a 5/8 wave whip, you'll want to use horizontal radials
rather than ones that slope downwards (and which radiate out of phase with the main
part of the antenna.)

If it is a mag mount, just stick it on top of the fridge, a filing cabinet, metal heat duct,
cookie sheet or old washtub.
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ONAIR
Member

Posts: 1747




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« Reply #3 on: January 19, 2012, 01:05:52 PM »

Has anyone converted a 2 meter mobile antenna to a base antenna?
  Stick it on top of the outside part of your air conditioner!  A 20 inch pizza pie plate can also do the trick.
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KC8Y
Member

Posts: 270




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« Reply #4 on: January 19, 2012, 01:17:19 PM »

In my 15-yr involvement in 2 meter FM:
use only a HUSTLER Collinear High Gain Mobile Antenna CG-144 with the HUSTLER MKR-2 Radial Base Kit; as a base
antenna.  It's about 15-feet above the ground.  Works super.

it's about 15-years old now and still works perfect
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KB4QAA
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Posts: 2487




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« Reply #5 on: January 19, 2012, 08:36:12 PM »

I sure did.  Took the 2M magmount and dropped on top my steel filing cabinet!
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K2OWK
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Posts: 1077




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« Reply #6 on: January 19, 2012, 10:41:08 PM »

Hello KC8YKB,
    QST had an article on the construction of a 2 meter base station from a mobile magmount. It used the top of a paint can with four radials that could lay flat or droop. The radial wires were heavy enough to bend to the desired position for best VSWR. I do not remember what issue it was in.

73s

K2OWK 
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K1CJS
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Posts: 6061




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« Reply #7 on: January 20, 2012, 04:28:14 AM »

Anyone can make a mobile 2 meter antenna into a home shack antenna--just look at the replies.  BUT...  If you want premium operation and the best distance "getting" antenna, no mobile antenna is going to beat a good gain antenna made to be installed in a fixed location.  I have a Hustler G7-144, and there is no way in hades that a mobile antenna is going to beat it--in any way except being a mobile antenna.
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WX7G
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Posts: 6317




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« Reply #8 on: January 20, 2012, 05:01:45 AM »

Has anyone converted a 2 meter mobile antenna to a base antenna?

Why yes they have.
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KI4SDY
Member

Posts: 1452




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« Reply #9 on: January 20, 2012, 06:16:10 AM »

It is so cheap and easy to make an excellent performing 1/4 wave ground plane antenna out of a SO239 connector and solid copper wire, that converting a mobile antenna (that you may have another use for) is not necessary.  Grin

« Last Edit: January 20, 2012, 04:33:38 PM by KI4SDY » Logged
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